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简介
JavaEE在开发的时候,如果是系统内部常量,一般提倡用枚举常量类,写在单独的类中,但是经常要修改的变量,比如数据源配置,如果存在数据库中,有种浪费。...
简介
JavaEE在开发的时候,如果是系统内部常量,一般提倡用枚举常量类,写在单独的类中,但是经常要修改的变量,比如数据源配置,如果存在数据库中,有种浪费。但是存在TXT中扩展性不好,就笔者观察,一般的程序员都喜欢把经常修改的常量存在xml文件或者properties文件。
存在xml文件最大的好处是扩展性很好,一般用sax或者dom这两个方向的框架,比如DOM4J,JDOM等。Sun推出的JAXM(Java API for XML Messaging)也是用的DOM4J。由于SAX的处理方式类似流媒体,是逐行的,不需要全部加载。而DOM是全部加载在内存,生成树。因而SAX的读取比DOM性能好,但是修改的话DOM略胜一筹。properties文件的扩展性不如xml,但是有很多xml没法实现的优势,比如加密之类的~
Helloworld
笔者根据自己开发中感受,写了一个工具包,用来体现读取xml或者properties的流程,大家在使用的时候记得修改文件路径。一共包含五个文件.本demo主要是用来模拟读取数据库的账户和密码的,读者可以在此基础上扩展。-Brief introduction
JavaEE development at the time, if the system constants are generally used to promote constant enumeration type, write in a separate category, but often want to modify the variables, such as the data source configuration, if the database exist, in one waste. But the existence of bad TXT extension on my observation, the programmers in general are often modified to enjoy the constant existence xml documents or document properties.
Xml files exist to expand the biggest benef
- 2022-06-01 17:25:12下载
- 积分:1
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一条 显示的跑马灯
一条 显示的跑马灯-a show of a 5,250
- 2022-06-14 12:09:54下载
- 积分:1
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简单的Servlet程序,比较简捷,易于学习
简单的Servlet程序,比较简捷,易于学习-simple procedures, more simple and easy to learn
- 2022-03-02 19:35:55下载
- 积分:1
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不错的 一个软件,很多人用了 多说不错
大家实施吧,共同努力...
不错的 一个软件,很多人用了 多说不错
大家实施吧,共同努力-a good software, a lot of people used to say well we implement it, and work together
- 2022-05-31 21:28:48下载
- 积分:1
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邮件的Webmail版本JSP、JavaBean、Servlet模式
邮件系统webmail版,jsp+javabean+servlet模式实现-mail webmail version jsp javabean servlet Mode
- 2022-12-23 21:35:04下载
- 积分:1
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一个flash调用java的经典案例,架构如下: flash actionscript+tomcat+java...
一个flash调用java的经典案例,架构如下: flash actionscript+tomcat+java-called a flash of java classic cases, structure is as follows : java flash actionscript tomcat
- 2022-02-12 09:47:56下载
- 积分:1
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该程序是实现JAVA中用applet实现图片的加载和视频,音频的加载!...
该程序是实现JAVA中用applet实现图片的加载和视频,音频的加载!-The program is to achieve the realization of JAVA using applet to load images and video, audio add-ons!
- 2022-10-23 12:50:03下载
- 积分:1
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介绍用Java计算以下几种统计值的方法:平均数,中位数,众数,标准方差,回归方程式,相关系数....
介绍用Java计算以下几种统计值的方法:平均数,中位数,众数,标准方差,回归方程式,相关系数.-introduced Java calculated value of the following types of statistical methods : the average, median, mode, standard deviation, the regression equation, the correlation coefficient.
- 2022-07-06 22:00:49下载
- 积分:1
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Java加密组件DES实现RSA和SHA加密算法
Java加密组件DES实现RSA和SHA加密算法-Java Encryption Component DES encryption algorithm to achieve RSA and SHA
- 2023-05-08 16:30:03下载
- 积分:1
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这个简单的计算器我已经建立。
This simple calculator I ve build.
I used Netbeans to create the interface and controlling it s event.
This is (not A perfect one) mathematical sentenced deriven calculator, meaning it gets a mathematical sentence, that follows a simple pattern. that pattern is then translated to A container object, that identifies the sentence parts, and then calculates them.-This is simple calculator I ve build.
I used Netbeans to create the interface and controlling it s event.
This is (not A perfect one) mathematical sentenced deriven calculator, meaning it gets a mathematical sentence, that follows a simple pattern. that pattern is then translated to A container object, that identifies the sentence parts, and then calculates them.
- 2022-01-22 17:03:48下载
- 积分:1